chore(deps): update actions/checkout action to v7.0.1 #3422

Job	Run time
Integration Tests (pdm.minimal.lock)	40s
test_min_deps (ubuntu-latest)	34s
Integration Tests (pdm.lock)	20s
test (3.14, macos-latest)	46s
test (3.14, ubuntu-latest)	51s
test (3.13, macos-latest)	39s
test_min_deps (windows-latest)	1m 10s
test (3.12, windows-latest)	1m 27s
test (3.13, ubuntu-latest)	52s
test_min_deps (macos-latest)	28s
test (3.13, windows-latest)	1m 31s
test (3.12, macos-latest)	49s
test (3.14, windows-latest)	1m 31s
test (3.11, windows-latest)	2m 0s
test (3.11, ubuntu-latest)	47s
test (3.11, macos-latest)	32s
test (3.12, ubuntu-latest)	1m 5s
Combine & check coverage	13s
	16m 15s

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